Nonextruding asphalt joint



Patented July 28, 1936 NONEXTRUDING ASPT JOINT Robert R. Robertson, Chicago, Ill., assignor to vThe Translode Joint Company, Chicago, lill., a

corporation of Illinois Application August 14, 1935, Serial No. 36,111

17 Claims.

vided in groove forming plates clamped against the sides of the apertured portions of the asphalt ller to form upper and end stop shoulders on the ller to obviate leakage into the joint.

It is an object of this invention to provide an expansion joint for roads and the like, said joint including in combination a base unit and a core unit supported thereby, said core unit including an apertured preformed plastic ller having groove forming plate members secured on opposite sides thereof, said base unit, the plastic filler and the groove forming plates adapted to be embedded in concrete, and said filler adapted when compressed, by the expansion of the concrete, to ow into the filler apertures and into the grooves formed by said plates to provide a non-extruding type of road joint ller mechanism.

It is also an object of this invention to provide an expansion joint road forming mechanism including a non-extruding apertured plastic filler and means engaged on the sides of the filler to provide grooves'for receiving parts of the filler when the same is compressed due to the expansion of the road slabs between which the joint is formed.

It is also an object of this invention to provide a concrete joint forming device including a plastic core having groove forming means seated on each side thereof, said plastic core being provided with apertures the size and number of which are determined by the maximum degree of compression for which the core is designed.

It is a further object of this invention to provide a concrete expansion joint mechanism including a base on which is supported a nonextruding beaded plastic filler having openings provided at intervals therein and adapted to be filled by the material forming the filler when said filler is compressed between concrete slabs.

It is an important object of this invention to provide an expansion joint mechanism for embedding in concrete to separate concrete road slabs, said mechanism comprising base for supporting groove forming plates on opposite sides of a preformed plastic filler having a plurality of openings punched therein whereby when the joint mechanism is embedded between concrete road slabs said preformed plastic filler forms a non-extruding core which is compressible with the expansion of the road slabs and is prevented from extruding from the joint due to the fact that the material forming the plastic filler is permitted to ll in the openings provided therein for the purpose.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawing.

This invention (in a preferred form) is illustrated in the drawing and hereinafter more fully described. l

On the drawing:

Figure 1 is a transverse Vertical fragmentary section taken through an expansion joint mech,- anism embedded between concrete road slabs and including an improved apertured preformed plastic ller having groove forming plates contacting opposite sides thereof.

Figure 2 is a similar sectional view with the ller cap removed and illustrating the position of the parts when the concrete road slabs have expanded to compress the plastic ller causing the filler material to extrude into the apertures and grooves, said view also indicating in dotted lines the separation of the concrete slabs from the plates and core upon the contraction of the road slabs. I

Figure 3 is a fragmentary side elevation of the preformed plastic filler removed from the joint and illustrating the cuts in the ller covering.

Figure 4 is a fragmentary side view of the plastic ller showing the groove forming plate in position and partly broken away to illustrate the resultant plastic beads or shoulders and the filled in apertures in dotted lines.

Figure 5 is a fragmentary vertical sectional view taken through a concrete road section, the slabs of which are separated by a modified form of expansion joint mechanism including the preformed apertured plastic filler and the groove forming plates on opposite sides thereof.

Figure 6 is an enlarged fragmentary sectional view of the plastic ller and the groove forming plates with the paper coverings of the ller exaggerated and ,showing the cuts for permitting the extruding of the material when the filler is compressed.

Figure 7 is a vertical sectional view of a modroad sub-grade in the regular manner.

ifled form of preformed plastic filler having preformed ribs or beads integrally cast on the sides thereof to which the groove forming plates are secured.

Figure 8 is a similar fragmentary view of a ller having modified forms of plates on the sides thereof carrying preformed plastic bars or heads for contacting the sides of the ller.

As shown on the drawing:

Figures 1 and 2 illustrate a vertical sectional view of an improved road expansion joint forming mechanism which is embedded between concrete road slabs I which are supported upon the In the form of the device illustrated in Figures 1 to 4 inclusive, the expansion joint is of the load transmission type including a load transmission base unit which serves as a load transmitting medium between the adjacent slabs of the concrete road. In the present showing, the base unit comprises an elongated base member consisting of a solid base plate 2 constructed of sheet metal or other suitable material. The longitudinal margins. of the base plate 2 are bent upwardly and then inwardly toward one another to form oppositely positioned guide channels 3. The guide channels 3 of the base unit provide oppositely positioned guide grooves 4. The margins of the top plates of the guide channels 3 are bent upwardly and are cut away to provide spaced upwardly projecting retaining flanges 5. Theretaining flanges 5 on opposite sides of the base unit are staggered with respect to one another. Notches are provided between the retaining fianges `5 on each side of the base unit to permit load transmitting anchor shoes or holders to be seated therein in proper spaced relation for the support of a core unit hereinafter more fully described.

The load transmitting mechanism associated with the base unit consists of a plurality of anchor shoes or holders which are movably or shiftably engaged in the base section and are arranged longitudinally in offset or staggered relation with respect to one another. The anchor shoes or holders are of substantially identical construction and are arranged with th` adjacent shoes reversed with respect to one another as clearly illustrated in Figure 1. Each et the anchor shoes is constructed of metal and comprises an angle bar including a base flange and an upright ange or web 1 integral with said base flange. Struck outwardly from thr upper margin of each of the flanges or webs 1 are anchoring blades or wings 8 leaving the irner side of the upright fiange or web fiat. j

Supported on the base flanges 6 of the anchor shoes between the upright flanges or webs 1 is a preformed plastic filler or core board 9 constructed of asphalt or other suitable material. The preformed filler board 9, as clearly illustrated in Figure 3 is provided with longitudinally directed staggered rows of apertures or openings I Il which may be of different sizes as illustrated, if desired. The apertures or openings I0 are provided in the preformed plastic filler 9 for the purpose of providing sufficient space into which the material forming the filler may be squeezed when the plastic ller or core is compressed due to the expansion of the road slabs I. The size and number of the apertures are regulated or determined by the degree of compression to which the core board 9 is designed to be subjected to, so that the maximum amount of compression may be applied to the core board without causing extrusion of the plastic material from the joint.

Secured to opposite sides of the plastic core board 9 -are layers of paper or cover sheets II, each provided with an upper longitudinal slit or cut I2 and with two vertical side slits or cuts I3 to afford weakened portions to facilitate extrusion of the plastic material when the core board is compressed.

Engaged against each side of the apertured portion of the preformed plastic filler 9 is a groove forming frame in the form\of a metal plate I4, the upper longitudinal portion and the end margins of which are deflected outwardly to form mouldings I5,the edges of which are deflected inwardly toward the filler to form the flanges I6. Before the concrete is poured the groove forming frames are projected downwardly between the side surfaces of the core board 9 and the straight surfaces of the upright flanges or webs I of the anchor shoes, thereby holding the edges of the top fiange I6 against the sides of the plastic filler to provide top and side grooves I1. Since the groove forming frames are positioned on opposite sides of the preformed plastic filler or core board 9 the grooves I1 are formed on opposite sides of the filler as clearly illustrated in Figure 1 with said grooves I1 communicating with certain of the apertures I0 of the plastic filler board 9.

Before the pouring of the concrete to form the road slabs I, a cap I8 is removably engaged over the upper margin of the plastic filler board 9. Engaged within the cap I8 is a supporting pad or bar I9 which forms a part of the cap and rests upon the top edge of the filler board 9 to hold the removable cap I8 in a set position of adjustment. The cap I8 together with the bar I9 are removed after the pouring of concrete to provide a groovein the concrete between the i road slabs I above the plastic ller board 9. The

y scribed, the asphalt filler fills the apertures Ill and the grooves II, and assumes the compressed form illustrated in Figure 2. The asphalt extruding through the slits or cracks I2 and I3 of the side coverings of the core board 9 fills the grooves I1 to form the plastic top and end mouldings 2I (Figure 4) which serve as top and end shoulders to prevent leakage into the joint. The apertured core board 9 is thus compressed into a solid board having the stop shoulders or mouldings 2| integrally formed on the sides thereof.

After the compression of the plastic core board 9 into the shape illustrated in Figure 2, the concrete slabs upon contraction, due to a reduction in the temperature thereof, pull away from opposite sides of the compressed core unit into approximately the positions illustrated in dotted lines in Figure 2, with the concrete separating from the metal frame plates I4 and I5, leaving said plates adhering to the sides of the plastic core. Attention is called to the fact that when the concrete slabs contract and separate, that the top and ends of the joint inwardly to said stop anges I6.

Figure illustrates a modified form of non-extruding expansion joint embedded between concrete road slabs I and resting upon the subgrade of a road in the customary manner. The modified form of expansion joint comprises a base plate 22 constructed of sheet metal or other suitable material. The longitudinal margins of the base plate 22 are bent upwardly and then inwardly toward one another to form oppositely positioned guide channels 23. Slidably engaged in the guide channels 23 are a pair of base flanges 26 which are integrally formed on the lower edges of a pair of base plates 25. 'I'he upper margins of the base plates 25 are deflected outwardly to provide the inclined walls 25 having the upper margins thereof deflected inwardly toward one another to form the top flanges 2l thereby forming mouldings providing recesses or grooves 28. Engaged downwardly between the plates 25 is a preformed plastic filler or board 23 constructed of asphalt or other suitable material similar to the board illustrated in Figure 3. The asphalt filler is punched out at intervals to provide a series of apertures or openings which are closed by means of the plates 25 and the upper groove forming portions 26 of said plates. With the expansion of the road slab I due to temperature changes, the slabs move toward one another and compress the preformed plastic ller 23 causing the material to flow into the openings 30 and into the grooves 28 similar to the arrangement illustrated in Figure 2. The provision of the grooves 28 in the concrete slabs I and the provision of the openings 30 in the preformed plastic filler 29 produces a. non-extruding asphalt expansion joint between the road slabs I for the reason that sufflcient areas are provided for the reception of the material forming part of the plastic ller when the same is compressed by the expansion of the road slabs.

Figure 7 illustrates a. modied form of preformed plastic core unit comprising a plastic board 3| provided with apertures 32 and having integrally formed on the sides thereof plastic beads or bars 33. The beads 33 and the sides of the board 3| are covered with a paper covering 3d. Positioned against the sides of the board 3l are metal plates 35 having outwardly deected portions 36 terminating in straight flanges 31 which contact the b eads 33 and may be secured thereto by nails or the like. The plate portions 36 and 3l provide grooves 38 for the reception of plastic material from thesboard 3l when the same is compressed between concrete road slabs. The material filling the grooves 38 forms stop mouldings similar to the mouldings 2I illustrated in Figure 4.

Figure 8 illustrates a. fragmentary portion of another modified form of core unit comprising a preformed apertured plastic core board the same as illustrated in Figures 1 and 3. Positioned on opposite sides of the core board are groove forming metal plates similar to those shown in Figure 7. In this modified form preformed plastic beads or bars 39 are secured to the inner sides of the plate fianges 3l, by nails or other suitable means, and are positioned to contact against the covered sides of the board prior to the pouring of concrete to form the road slabs.

It will of course be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is therefore not the purpose to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

I claim as my invention:

l. An expansion joint forming mechanism comprising a base. a preformed filler ofv compressible material supported on the base and having a. plurality of openings therein, and groove forming plate members positioned on opposite sides of the apertured portion of said compressible filler.

2. An expansion joint forming mechanism comprising a base, a preformed filler of compressible material supported on the base and having a plurality of openings therein, groove forming plates positioned against opposite sides of the apertured portion of said filler, and a cap removably engaged over the upper edge of the ller.

3. An expansion joint forming mechanism comprising a base, a preformed filler of com'- pressible material supported on the base and having a plurality of openings therethrough and slits in the side surfaces thereof, and groove forming plate members contacting the opposite 5 sides of the filler.

4. An expansion joint forming mechanism comprising a, base, a preformed plastic ller board supported by the base, coverings on the side sur'- faces of the filler board having slits therein, said filler board and the coverings thereof having registering openings therein, and grooved framer members on opposite sides of the ller board and contacting said coverings to substantially enclose the openings and the slits in said cover- 35 ings.

5. A non-extruding asphalt road joint including in combination a pair of oppositely positioned concrete road slabs, an expansion joint base embedded in the slabs, a preformed asphalt filler board supported on the base between said slabs and 'having openings and slits therein, groove forming frame plates supported against opposite sides of the filler board and embedded in said slabs, and a groove forming cap removably engaged on the top of said ller board between said slabs.

6. A non-extruding asphalt road joint including in combination a pair of oppositely positioned concrete road slabs, an expansion joint base embedded in the slabs, load transmission members embedded in said slabs and movably engaged in said base, a. preformed plastic filler board supported between the load transmission members and between said slabs, said filler board having openings therein and slits cut in the side surfaces thereof, groove forming plates supported between the load transmission members and said ller board and partly embedded in the road slabs, and a cap removably engaged on the filler board.

7. A non-extruding asphalt joint for embedding in concrete and comprising a. load transmission base, and a preformed plastic filler board supported thereby and having openings therein arranged to be filled by the plastic material of the filler board to obviate extrusion of the plastic material from the concrete when due to temperature increases the concrete expands and, compresses the filler board.

8. A non-extruding asphalt joint embedded in concrete and comprising a base, a preformed asphalt filler board on the base and embedded in the concrete, and side coverings on the filler board, said filler board and side coverings having registering openings therein.

`9. A non-extruding asphalt joint including in combination a core unit comprising a preformed plastic board having openings therein, and coverings on the sides of the board having openings therein registering with the openings in said board, said coverings having weakened portions provided therein.

10. A non-extruding asphalt joint for embedding in concrete and comprising a base, a preformed plastic filler board thereon having openings therein, coverings on the sides of the board also having openings therein registering with the openings in the board, and plate members embedded in the concrete on opposite sides of the board for closing said openings, said plate members having mould portions for forming framelike grooves in the concrete communicating with the openings, said coverings having weakened portions adjacent the grooves whereby said board when compressed by the expansion of the concrete extrudes into the openings and out through said weakened portions of the coverings to ll the grooves and form stop beads on the sides of the compressed board.

11. A non-extruding asphalt joint for embedding in concrete and including in combination a core unit comprising a preformed plastic filler board having openings therein to be filled by the material forming the board when the board is compressed due to the expansion of the concrete, and grooved plates on the sides of the board having the grooves thereof facing the board to be filled by material from the board to integrally form stop mouldings on the sides of the board,

12. A non-extruding asphalt joint for embedding in concrete and including in combination a core unit comprising a preformed plastic filler board having openings therein, plastic ribs integrally formed on the sides of the board above the openings. and groove forming plates positioned against the sides of the board and secured to said ribs.

v 13. A joint forming mechanism including in combination a core unit comprising a preformed plastic ller board having openings therein, groove forming plates positioned against the sides of the board, and plastic bars secured to the plates and contacting the board.

14. A joint forming mechanism including in combination a core unit comprising a preformed plastic filler board having openings therein, and means for forming intersecting stop mouldings on both sides of the board, when the board is compressed.

15. A joint forming mechanism including in combination a core unit comprising a plastic filler board, plates positioned adjacent the sides of the board, and bar members projecting beyond the sides of the plates for holding portions of said plates spaced from the board to form spaces between the plates and said board.

16. A joint forming mechanism including in combination a core unit comprising a plastic filler board, and coverings on the sides of the board having slits therein for the extrusion of the material forming the board when said board is compressed.

17. A non-extruding asphalt joint for embedding between concrete slabs and including a core unit comprising a preformed plastic ller board having slits in the side surfaces thereof,` and plates on the sides of the board having grooves formed therein and covering said slits to be filled by the material forming the board to form stop mouldings on the sides of the board when the board is compressed due to the expansion of the concrete slabs.v

ROBERT R. ROBERTSON. 

